why do my Toyota Corolla E170 (2013-2019) interior lights stay on after closing the doors

Toyota Corolla E170 (2013-2019)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

552 words

Problem Statement

Learn how to diagnose and fix the issue of interior lights staying on in a Toyota Corolla E170 (2013-2019). Step-by-step guide with diagnostic procedures.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems to prevent shock or short circuits.

Symptoms

•Interior lights do not turn off after closing the doors
•Dimming of interior lights may not occur
•Possible battery drain if the issue persists
•Door ajar warning light may be illuminated on the dashboard
•Unusual clicking or buzzing sounds from the door switches

Diagnostic Steps

1
Inspect the door switches for proper operation and any signs of damage or wear.
2
Check the door latches to ensure they are functioning correctly and not obstructed.
3
Scan for any error codes using an OBD-II scanner to identify electrical faults.
4
Test the interior light switch to verify that it is not stuck in the 'on' position.
5
Examine wiring and connections around the door switches for shorts or corrosion.
6
Check the vehicle's body control module for any faults related to lighting control.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Multimeter
•OBD-II scanner
•Socket set
•Screwdriver set
•Flashlight

Parts Required

•Door switch (if faulty)
•Body control module (if required)

Related Faults

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Diagnostic Steps

1
Inspect the door switches for proper operation and any signs of damage or wear.
2
Check the door latches to ensure they are functioning correctly and not obstructed.
3
Scan for any error codes using an OBD-II scanner to identify electrical faults.
4
Test the interior light switch to verify that it is not stuck in the 'on' position.
5
Examine wiring and connections around the door switches for shorts or corrosion.
6
Check the vehicle's body control module for any faults related to lighting control.

Solution

1. Preparation

Tools Required: Multimeter, OBD-II scanner, socket set, screwdriver set, flashlight.
Disconnect the negative battery terminal to prevent electrical shock while working on the vehicle.

2. Inspect Door Switches

Locate the door switches, usually mounted on the door frame or latch assembly.
Use a multimeter to check for continuity in the switch when pressed and released.
If faulty, remove the old switch by unscrewing or unclipping it from its housing.
Replace with a new door switch and reconnect it.

3. Check Door Latches

Open each door and inspect the latch mechanism for debris or obstruction.
Lubricate the latch with penetrating oil if it appears sticky or rusty.
Ensure the latch is fully engaging when the door is closed; adjust if necessary.

4. Test Interior Light Circuit

Reconnect the negative battery terminal.
With the doors closed, operate the interior light switch to ensure it functions correctly.
If the light still stays on, inspect the wiring harness for any shorts or breaks.

5. Inspect Body Control Module

If the issue persists, access the body control module (BCM) located under the dashboard.
Use an OBD-II scanner to check for any stored diagnostic trouble codes related to the lighting system.
Clear any codes and retest the system; replace the BCM if it shows persistent faults.